US think-tank hits out at stars' vaccine myths

A US think-tank has attacked campaigns by celebrities who undermine immunization programs, despite over 20 scientific studies since 1998 which have concluded that the measles-mumps-rubella vaccine does not raise a child's risk of autism. Sally Pipes, the president of the San Francisco, California-based Pacific Research Institute, singled out actors Jim Carrey, Jenny McCarthy and Holly Robinson Peete, for "continuing to perpetuate the myth linking autism and vaccination. In the process, they're endangering public health."